Putting it all together
In our final project of this chapter, we are going to make use of everything we have learned in the preceding sections. We are going to use the ultrasonic distance sensor to recognize a hand movement in close proximity to the sensor. We are using the 7-segment display to count down from 20 to 0 and we are going to use a buzzer, to provide an additional signal, for the timer start and the timer end. In Germany, it is officially recommended that we wash our hands for at least 20 seconds, which is why we will also add a timer for 20 seconds. Putting all of this together, we will create a touchless handwash timer.
Before we start to write the code to control the hand wash timer, we need to add a buzzer. We can add this by following these steps:
- Put the GND pin of the buzzer in D53 and the VCC pin of the buzzer into
D54. If that is too close together for your buzzer's pins, just put the buzzer in and wire the following two wires accordingly. - Connect...
